iw-phy: add page (#22768)

pages/linux/iw-phy.md

@@ -0,0 +1,16 @@
+# iw phy
+
+> Manage wireless radios.
+> More information: <https://wireless.docs.kernel.org/en/latest/en/users/documentation/iw.html>.
+
+- Display info on all physical Wi-Fi radios:
+
+`iw phy`
+
+- Display info on a specific Wi-Fi radio:
+
+`iw phy phy{{0}} info`
+
+- Display channels available to a Wi-Fi radio:
+
+`iw phy phy{{0}} channels`